Nel is doing a seated side stretch to loosen some tension she has built up after having been stuck in an office chair all day.
The purpose of the side stretch is to target the muscles between the ribs and the hip, which can get tensed after having spent a lot of time sitting down, or slept on a too soft madras. Another reason can be that one of your legs are slightly shorter than the other. This is an easy stretch exercise you can do both standing up and sitting down.
Sit straight and tense your abs slightly. Raise your right arm above your head and slowly lean to the left until you feel tension on your side. It’s ok to bend your arm to get deeper into the stretch. Don’t lift your butt from the chair or lean forward or backward. Hold the position for the desired amount of time and then switch to the other side.
You can also do this the side stretch while standing up. Stand with your feet shoulder width apart and raise your right arm above your left and slowly lean into the stretch. Hold the position for the desired amount of time and then switch to the other side.
Situation: Sitting down, while at work
Sit on the edge of the chair and lean forward and grab hold of your left foot with your righ hand. Without arching your back, bring your belly towards your thighs. You should feel the tension on the back of your left leg. Keep the stretch for about 10 seconds and repeat a couple of times before switching leg.